OK the main problem is, i cant get much power when i aim for hte head and he is standing up without any crouch. Coz i hvae to knee so high. So i guess it has to be a flying knee. I know you can get power on this becasue i saw Belfort knock down and finish that short stocky black guy cant remember his name, with flying knees to the head. Its like a jumping knee, you jump to get high enough, but when i do it it feels like im just floating into the air, i dont feel any power.